degras

noun
de·gras | \dāˈgrä\
plural degras\-äz \

Definition of degras 

1a : a fatty substance obtained by pressing certain skins following the action of oxidized fish oil on them and used in dressing leather

called also moellon

— see sod oil

b : a mixture of this substance with other fats or fatty oils (as fish oils) or sometimes wool grease

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History and Etymology for degras

French dégras, back-formation (influenced by gras fat, from Latin crassus thick, fat) from dégraisser to remove the fat from, from Middle French desgresser, from des-, de- de- + gresse, graisse fat, grease

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